ST STM32F405 Reference Manual page 1271

RM0090
34.16.2 OTG_FS global registers
These registers are available in both host and device modes, and do not need to be
reprogrammed when switching between these modes.
Bit values in the register descriptions are expressed in binary unless otherwise specified.
OTG_FS control and status register (OTG_FS_GOTGCTL)
Address offset: 0x000
Reset value: 0x0001 0000
The OTG_FS_GOTGCTL register controls the behavior and reflects the status of the OTG
function of the core.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
Reserved
Bits 31:20 Reserved, must be kept at reset value.
Bit 19 BSVLD: B-session valid
Indicates the device mode transceiver status.
0: B-session is not valid.
1: B-session is valid.
In OTG mode, you can use this bit to determine if the device is connected or disconnected.
Note: Only accessible in device mode.
Bit 18 ASVLD: A-session valid
Indicates the host mode transceiver status.
0: A-session is not valid
1: A-session is valid
Note: Only accessible in host mode.
Bit 17 DBCT: Long/short debounce time
Indicates the debounce time of a detected connection.
0: Long debounce time, used for physical connections (100 ms + 2.5 µs)
1: Short debounce time, used for soft connections (2.5 µs)
Note: Only accessible in host mode.
Bit 16 CIDSTS: Connector ID status
Indicates the connector ID status on a connect event.
0: The OTG_FS controller is in A-device mode
1: The OTG_FS controller is in B-device mode
Note: Accessible in both device and host modes.
Bits 15:12 Reserved, must be kept at reset value.
Reserved
r r r r
RM0090 Rev 18
USB on-the-go full-speed (OTG_FS)
9 8 7 6 5
Reserved
rw rw rw r
4 3 2 1 0
rw r
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